Strategies for Film Replacement in Radiography Films and Digital Detectors in Comparison
作者单位：Institute for Materials Research and Testing (BAM)D-12200 BerlinGermany YXLON International GmbHD-22419 HamburgGermany
会议名称：《17th World Conference on Non-Destructive Testing》
会议日期：2008年
学科分类：08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 081102[工学-检测技术与自动化装置] 0811[工学-控制科学与工程]
关 键 词：Radiography Film replacement Computed radiography Imaging plates Digital detector arrays Contrast sensitivity SNR Standards
摘 要：正The NDT community has discussed about effective film replacement by Computed Radiography（CR）and the new Digital Detector Arrays（DDA）,also known as flat panel detectors,since more than 10 *** standards were published by CEN,ASTM and ASME to support the application of phosphor imaging plates in lieu of X-ray film in the year *** of the key concepts is the usage of signal/noise（SNR）measurements as equivalent to the optical density of film and film system *** radiographic practice with DDAs is not yet described by any standard,but proposals are under *** first qualification standard for DDAs,ASTM E 2597-07,has been published recently. The bad pixel problem has been *** methods were elaborated and tested at BAM for determination of parameters as basic spatial resolution,efficiency,specific material thickness range,contrast sensitivity and image *** procedures were used for this study. The achieved image quality is discussed for film replacement by CR and DDAs in weld *** strategies for correct DDA calibration yield an extra ordinary increase of image *** contrast sensitivity was enhanced up to 10 times in relation to film *** could not yet be achieved by any other *** restrictions in the spatial resolution,provoked by the individual picture element（pixel）size of the detector,are compensated by the increased contrast sensitivity.